DConstantDistribution





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CapeTools Statistical Distributions function list

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Creates a Discrete Constant distribution object (Discrete Distribution).

The string 'Key' resulting from a successful construction of this distribution object can be passed to the following functions in order to query (mean, std deviation and variance) or execute functions (probability function, cumulative density function etc...) based on this distribution object : DDistributionMean(), DDistributionVar(), DDistributionSTD(), DDistributionPF() or DDistributionCDF(). In addition, the string 'Key' resulting from a successful construction of this distribution object will also allow you to construct a process generator object via a call to PGDConstantDistribution(). A process generator object allows you to generate large amounts of random numbers based on this distribution.

Even though PGDConstantDistribution() is the process generator object, the function RandomDConstant() is the actual function that obtains the random numbers given a count parameter and the process generator string 'key'.



This function creates an object and returns a string-key value to represent this created object.
The TAG value of the string-key returned (second part of the key) is : "DConstant"



Note: Within Excel, the function is named - CT.STAT.DConstantDistribution




High level graphic of DConstantDistribution() function with parameters. Blue square node is the actual function with the parameters ordered.



Parameter Description


  1. Key parameter

    Key value to use as a handle for the created object
  2. Reload parameter

    When creating this object for the first time, set this parameter to a positive value. Within Excel, when re-computing a worksheet where you do not wish to recreate the object, set this parameter to zero (0).
  3. mean parameter

    mean of the distribution.


Extended information

Function Syntax

VB Syntax


String CTStatDistributions.DConstantDistribution( _
String Key, _
Long Reload, _
Long mean)


Excel Spreadsheet Syntax


=CT.STAT.DConstantDistribution(
Excel String Cell Key,
Excel Numeric Cell Reload,
Excel Numeric Cell mean)


C++ Syntax


static std::string DConstantDistribution(
std::string Key,
long Reload,
long mean);


DotNET Syntax


System.String CTStatDistributionsSA.DConstantDistribution(
System.String Key,
System.Int32 Reload,
System.Int32 mean);

Parameter data types

ArgNameArgTypeIsKey
KeyStringFALSE
ReloadLongFALSE
meanLongFALSE


Example Inputs

The first column represents the name of the parameters. The second column specifies whether the parameters are optional or not. Finally the last column provides some sample input data.
Function call input string-keys are always in the format : "NAME.EXTTAG.TICKER" The "EXTTAG.TICKER" part is determined from the output of other, capetools, object creation functions.


ArgNameIsOptional (Excel only)Example
KeyFALSEMyDConstantDistribution
ReloadFALSE1
meanFALSE0


Example function usage


The C# example below contains all the sub-function calls leading up to this function call. As a result, the example can contain a lot of code.

The VB.NET, J#, C++.NET, Java, Excel VBA, Visual Basic 6 (via COM) and C++ examples below contain function code stubs for the calls leading up to this function call. However, the function call for this function is displayed.
You can easily reproduce the stub functions code from the C# example.


If you are accessing this functrion via the MiniXL libraries, this function is present within the CT.QL.Statistics20 MiniXL Excel Addin.

Within our Excel Example Addin Generator, we have used the following QuantTools sub-functions in order to prepare the arguments needed to call the DConstantDistribution() function. If you are executing this function via the MiniXL libraries, the module addin name, (in brackets, to the right of the sub-functions listed below), indicates the MiniXL library in which the sub-function is held. You will need to load this library into your Excel session (along with any other libraries that the sub-function call within the addin requires (ie - CT.QT.Utils20 addin in almost all cases) in order for the example to compute successfully.


The following four examples demostrate calling this function within a Microsoft .NET environment

The following four examples demostrate calling this function within a non .NET environment

The following is a sample output from executing the DConstantDistribution() function call


MyDConstantDistribution_8.DConstant.0

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